The 4th OST for the TV drama "SHE WAS PRETTY" which continues to reset its ratings with each episode has been revealed! "You don't know me" is by SISTAR's SOYOU and BROTHER SU.

"You don't know me" is a duet, unusual for a drama OST. It is full of sentimental, yet catchy melody, sung in SOYOU and BROTHER SU's unique and genuine voices. The lyrics, interpreting "not knowing" in two different ways, are very interesting, adding to the song's perfection.